Mill and power mechanism



(Nol Model.)

E. C. GRIFFIN.

- MILL AND POWER MBGHANISM.

No. 464,500. Patented Dec. 8, 1891.

UNITED STATES 'PATENT OFFICE.

EDIVIN C. GRIFFIN, vOF IVEST NEWTON, MASSACHUSETTS.

MILL AND POWER MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 464,500, ,datedDecember 8, 18917 Application filed March 31, 1891i Serial No. 387,099.(No model.)

To all whom it may con/cern:

Be it known that I, EDWIN C. GRIFFIN, a citizen of the Dominion ofCanada, residing at West Newton, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inMills and Power Mechanism; and I do hereby declare the following to be afull, clear, and eX- act description of the invention, such as willenable others skilled in the art to which it ap pertains to make and usethe same.

' My invention relates, generally, to pulverizing-mills, andparticularly to that class thereof in which the reduction orpulverization of ores and other substances is accomplished by therevolution of a roll or rolls within and against the inner surface ofrings or annular dies, and in which said roll or rolls are held incontact with said rings or annular dies by centrifugal force when themills are in operation; and it consists in the improvements in theconstruction, arrangement, and combination of parts disclosed in thefollowing specification, and pointed out in the claims.

The objects of my invention are the production of a mill in which oresor other substances may be cheaply and rapidly crushed and pulverized orreduced to a powder, to effect the application of the power employeddirectly to the roll-shaft whereby the roll will be caused to positivelyrotate againstl the annular die, gyrate around the inner surface of thesame, and by its rotary momentum and centrifugal force crush andpulverize the material between the same and saiddie, and to provide amethod of doin gthis in which thepulley to which the power is applied isattached -rigidly and directly to the roll-shaft, and not,

as has heretofore been the case, by means of a universal joint orconnection. These objects are accomplished by the mechanism illustratedin the accompanying drawings forming part of this specification, inwhich similar numerals of reference designate like This invention is animprovement on that for which Letters Patent of the United States weregranted to James K. Griffin on August 2o, 1889, No. 409,579, ana relatesparticularly I to the means for supporting and operating thegrinding-roll and roll-shaft shown and described in said patent, all ashereinafter described.

Referring to the drawing, the referencenumeral l designates the casingof the grinding-chamber, preferably formed in two separable partsarranged to be bolted together, as shown, and 2 the annular die locatedtherein. This chamberor die, however, may be of any known or preferredconstructiomiand constitutes no part of this invention, but is shownonly for the purpose of illustrating the operation of theinventionclaimed hereinavhich consists of the means employed forsupporting theroll-shaft 3 and grinding-roll 4 attached to said shaft, and forrevolving the roll et around the inner surface of the annular die 2. Atthe top of the shell or casing 1 and preferably formed therein is asphericalsocket 5,provided with a cover G, also having aspherical undersurface, which is securely bolted, as shown, or otherwise secured to thecasing or shell l. In the spherical socket 5, and kept from upwardmovement by the cover 6, is a ball 7, preferably provided with anelongated downwardly-extending portion 8. The top of this ball 7 ispreferably partially fiat, as shown, and through the center thereof andthe elongated portion 8 is formed a bearing or journal preferablyprovided with a bushing 9 of any desired anti-friction composition, andaround the upper part of this journal in the ball 7 is formed a circulardepression somewhat larger than the same, in which rests a thrust-ringor washer l0. Resting upon this thrustfring 10 and supporting 4theroll-shaft 3, which passes through the journal in the ball 7 is a pulleyll, preferably of wood and of the form shown. This pulley 1l is providedwith a central metallic hub l2, through which passes the roll-shaft 3,and by which the pulley is rigidly secured to such shaft in any desiredmanner. This pulley ll is provided on its under surface with a centraldepression 13, and upon the lower portion of IOO its periphery with adriving-surface prefera` bly having grooves 14 for the reception ofdriving-ropes 15, as shown.

Through the top portion of the shaft 3 passes an oil-hole 16, adapted toregister with corresponding holes or grooves 17 in the thrust-ring 10and like holes 1S in the ball 7, by means of which the running parts ofthe device are kept thoroughly lubricated while running by theintroduction of oil through the hole 16.

With the construction described, when the pulley 11 is revolved by meansof the driving-ropes 15, or otherwise, rotary motion is therebytransmitted to the roll-shaft and to the grinding or pulverizing roll4,attached thereto, and it will be'seen that therolbshaft beingsupportedby the ball 7 has perfect freedom of movement at all times to swing inany desired direction without impeding or interfering with its lrotarymotion, thedevice by which theshaft is supported constituting a perfectuniversal joint.

Itwill be seen, upon an examination of the drawing, that by constructingthe pulley 11 inthe formshown and with the centraldepression 13 thecenter of the driving-face thereof and the center of the ball 7 Varebrought into thesame horizontal plane, and, although thedevice will Workwhen the driving-face of the` pulley is above or below the center of theball 7, the best results are 0b-A taincd by the form of constructionshown, the driving ropes or belt having then less tendency to interferewith the free oscillation of `the roll-shaft than when in any otherposition.

Although I `prefer to use a wheel :grooved, as shown, one provided withanges, oreven `perfectly plain, may be used; but upon a `plain wheel thebelts have `a tendency to run off, and those with grooves or flanges arefor that reason much to be preferred. It is evident that atoothed wheelor pulley, or Ea wheel driven by any device other than abelt orbelts-may be substituted for thepulley 11 without-departing from thescope of `my invention.

Although I prefer to` havethe shaft 3 revolve'within the `ball 7, aswell as the ball' 7 in the 'socket 5, it is evident that, if desired,the ball 7 may be rigidly secured to such `shaft? 3 and revolvetherewith, or although capable of oscillation be made non-revoluble,4and that instead of the form of universal joint herein described anyother form thereof may be employed without departing from the Vscope ofmy invention, so far as it relates to the combined pulley androll-shaftsupported by a universal joint, whereby the roll-shaft androll attached thereto have perfect freedom to Swingin anydirectionwithout impeding or interfering with the rotary movement thereof, andwhereby when the pulley is revolved the roll-shaft and roll lare given aradial rotary movement, vand the rollshaft and roll are gyrated aroundthe central axis of the mill, the roll being held in contact with the aconveyer y26.

annular die in the grinding-chamberwhen the mill is in operation bycentrifugal force, and falling away from said die when the mill is notin operation by gravity.

The operation of the device is as follows: The material to be pulverizedis introduced within the-grindingchamber by `means ofa spout 19 or inany other desired manner, and is taken up by the plows or stirrers 20,attached to the bottom of the roll 4, and is thrown against the` annulardie 2, Where 1t 1s operated upon and crushed or ground bythe roll 4, andthis'operation is repeated untllthe material has been reduced to therequired degree of neness, when it is discharged through the screens 21in the casing 1 into the annular lchamber 22 between the casing 1 `andthe sheet-iron ncover 23, from which it passes Ainto a receptacle orhopper 24 by means of passages 25, formed in ythelannular base of themill, from which it is `removed by The `operation of discharging thepulverizedmaterial through theiscreens- `2l may begreatlyfacilitated byfansor vanes (not-shown) attached to the `roll-shaft immediately abovethe roll in connection with the stirrers `or plows 20, as theyoperate toVcause an increased circulationof air through the mill and force theair, togetherfwith the pulver-ized materia-l, out'throughft-he screens21 into the chamber 22. Thevair` is drawn into the mill through theopenings 27 inthe casing 1, and down through the-central hole 2S inthehorizontal partition 30, in which the Vshaft 3 revolves by the`stirrers or plows 20, and also by-the fans or vanes mentioned, whenthe'same are used, `which thus also operates tokeepall dust orpulverized material `within the mill. Thisrfeature of construction,however, constitutes no part of the invention claimed herein, `and the`fans or Avanesfare therefore not shown.

Itis evident that many changesand modivfications other than thosementioned may :be

made in the construction,combination, and arrangement o'f thevariousfelements yof the invention described zherein `without fdepartingfrom the scope thereof, `and I do :not limit myself to theexact formshownyand it is also evident that the powermechanism, `consisting of thepulley "and the `shaft rigidly 'at tached thereto randsupported insuchaman- `ner as to be free to'oscillate infall directions,

which constitutes the main feature of my `invention, is applicable tomany uses other than that in connection with which itis here illustratedand described.

Having now fully described my invention, its construction, andoperatiomwhatl claim, and desire to secure by Letters Patent; :is-

1. In a pulverizing-mill,"the'combintfion, with an annular die, of aroll-shafta/nd `roll `supported by a universal joint or fcoupling,

and a pulley mounted on the 'roll-shaft,snb stantially as shown anddescribed.

2. In a pulverizing-mill, the combination, with an annular di'e, of aroll-shaft and roll IDO IIO

supportedby a universal joint orcoupling, and a pulley rigidly mountedon said shaft, whereby the shaft and roll may be rotated and the rollgyrated around the annular die, substantially as shown and described.

3. In a pulverizing-inill, the combination, with a frame or support, ofa roll-shaft and roll, the roll-shaft and the frame or support beingconnected by a universal joint or coupling, and a pulley mounted on theshaft, substantially as shown and described.

4. The combination, in a pulverizing-mill having an annular die locatedin the grinding-chamber thereof, of a frame or support, a roll-shaft androll, the shaft and the frame orvsupport being connected by a universaljoint or coupling, and a pulley mounted on the shaft, substantially asshown and de' scribed.

5. A shaft supported by a universal joint or coupling and capable ofbeing revolved and oscillated in all directions, in combination With apulley rigidly secured to the shaft in such manner that the center ofthe driving-face thereof and the center of the universal joint are inthe same plane, substantially as shown and described.

6. The combination, in a pulverizing-mill provided with agrinding-chamber having an annular die located therein, of a roll-shaftprovided with a roll revolubly supported by a universal joint in suchmanner as to be capable of oscillation in all directions, and adriving-Wheel or pulley rigidly secured to the roll-shaft in such mannerthat the center of the driving-face of the .pulley and the center of theuniversal joint or coupling are in the same plane, substantially asshown and de'- scribed.

7. In a pulverizing-mill, the combination, with an annular die locatedin the grinding-v chamber thereof, of a roll-shaft provided with a roll,a ball through which the shaft passes, constituting a bearing andsupport for the same, supported in a socket above the grinding-chamberin such manner as to be capable of oscillationy in all directions, and apulley secured to the roll-shaft above the ball, substantially as shownand described.

8. A shaft supported by a universalk joint or coupling and capable ofbeing oscillated Ain all directions as Well as rotated, in combinationwith a pulley secured thereto having a central depression in the facethereof nearest the supporting universal joint, substantially as and forthe purposes set forth.

Signed at the city and county of New York, in the State of New York,this 28th day of March, A. D. 1891.

EDVIN C. GRIFFIN.

Vitnesses:

J. P. GRIFFIN, C. L. DAVIS.

